/*
 * GPL HEADER START
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 only,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License version 2 for more details (a copy is included
 * in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU General Public License
 * version 2 along with this program; If not, see
 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
 *
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
 * CA 95054 USA or visit www.sun.com if you need additional information or
 * have any questions.
 *
 * GPL HEADER END
 */
/*
 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright (c) 2011, 2012, Intel Corporation.
 */
/*
 * This file is part of Lustre, http://www.lustre.org/
 * Lustre is a trademark of Sun Microsystems, Inc.
 *
 * lustre/obdclass/obdo.c
 *
 * Object Devices Class Driver
 * These are the only exported functions, they provide some generic
 * infrastructure for managing object devices
 */

#define DEBUG_SUBSYSTEM S_CLASS

#include "../include/obd_class.h"
#include "../include/lustre/lustre_idl.h"

void obdo_set_parent_fid(struct obdo *dst, const struct lu_fid *parent)
{
	dst->o_parent_oid = fid_oid(parent);
	dst->o_parent_seq = fid_seq(parent);
	dst->o_parent_ver = fid_ver(parent);
	dst->o_valid |= OBD_MD_FLGENER | OBD_MD_FLFID;
}
EXPORT_SYMBOL(obdo_set_parent_fid);

/* WARNING: the file systems must take care not to tinker with
   attributes they don't manage (such as blocks). */
void obdo_from_inode(struct obdo *dst, struct inode *src, u32 valid)
{
	u32 newvalid = 0;

	if (valid & (OBD_MD_FLCTIME | OBD_MD_FLMTIME))
		CDEBUG(D_INODE, "valid %x, new time %lu/%lu\n",
		       valid, LTIME_S(src->i_mtime),
		       LTIME_S(src->i_ctime));

	if (valid & OBD_MD_FLATIME) {
		dst->o_atime = LTIME_S(src->i_atime);
		newvalid |= OBD_MD_FLATIME;
	}
	if (valid & OBD_MD_FLMTIME) {
		dst->o_mtime = LTIME_S(src->i_mtime);
		newvalid |= OBD_MD_FLMTIME;
	}
	if (valid & OBD_MD_FLCTIME) {
		dst->o_ctime = LTIME_S(src->i_ctime);
		newvalid |= OBD_MD_FLCTIME;
	}
	if (valid & OBD_MD_FLSIZE) {
		dst->o_size = i_size_read(src);
		newvalid |= OBD_MD_FLSIZE;
	}
	if (valid & OBD_MD_FLBLOCKS) {  /* allocation of space (x512 bytes) */
		dst->o_blocks = src->i_blocks;
		newvalid |= OBD_MD_FLBLOCKS;
	}
	if (valid & OBD_MD_FLBLKSZ) {   /* optimal block size */
		dst->o_blksize = 1 << src->i_blkbits;
		newvalid |= OBD_MD_FLBLKSZ;
	}
	if (valid & OBD_MD_FLTYPE) {
		dst->o_mode = (dst->o_mode & S_IALLUGO) |
			      (src->i_mode & S_IFMT);
		newvalid |= OBD_MD_FLTYPE;
	}
	if (valid & OBD_MD_FLMODE) {
		dst->o_mode = (dst->o_mode & S_IFMT) |
			      (src->i_mode & S_IALLUGO);
		newvalid |= OBD_MD_FLMODE;
	}
	if (valid & OBD_MD_FLUID) {
		dst->o_uid = from_kuid(&init_user_ns, src->i_uid);
		newvalid |= OBD_MD_FLUID;
	}
	if (valid & OBD_MD_FLGID) {
		dst->o_gid = from_kgid(&init_user_ns, src->i_gid);
		newvalid |= OBD_MD_FLGID;
	}
	if (valid & OBD_MD_FLFLAGS) {
		dst->o_flags = src->i_flags;
		newvalid |= OBD_MD_FLFLAGS;
	}
	dst->o_valid |= newvalid;
}
EXPORT_SYMBOL(obdo_from_inode);

void obdo_cpy_md(struct obdo *dst, struct obdo *src, u32 valid)
{
	CDEBUG(D_INODE, "src obdo "DOSTID" valid %#llx, dst obdo "DOSTID"\n",
	       POSTID(&src->o_oi), src->o_valid, POSTID(&dst->o_oi));
	if (valid & OBD_MD_FLATIME)
		dst->o_atime = src->o_atime;
	if (valid & OBD_MD_FLMTIME)
		dst->o_mtime = src->o_mtime;
	if (valid & OBD_MD_FLCTIME)
		dst->o_ctime = src->o_ctime;
	if (valid & OBD_MD_FLSIZE)
		dst->o_size = src->o_size;
	if (valid & OBD_MD_FLBLOCKS) /* allocation of space */
		dst->o_blocks = src->o_blocks;
	if (valid & OBD_MD_FLBLKSZ)
		dst->o_blksize = src->o_blksize;
	if (valid & OBD_MD_FLTYPE)
		dst->o_mode = (dst->o_mode & ~S_IFMT) | (src->o_mode & S_IFMT);
	if (valid & OBD_MD_FLMODE)
		dst->o_mode = (dst->o_mode & S_IFMT) | (src->o_mode & ~S_IFMT);
	if (valid & OBD_MD_FLUID)
		dst->o_uid = src->o_uid;
	if (valid & OBD_MD_FLGID)
		dst->o_gid = src->o_gid;
	if (valid & OBD_MD_FLFLAGS)
		dst->o_flags = src->o_flags;
	if (valid & OBD_MD_FLFID) {
		dst->o_parent_seq = src->o_parent_seq;
		dst->o_parent_ver = src->o_parent_ver;
	}
	if (valid & OBD_MD_FLGENER)
		dst->o_parent_oid = src->o_parent_oid;
	if (valid & OBD_MD_FLHANDLE)
		dst->o_handle = src->o_handle;
	if (valid & OBD_MD_FLCOOKIE)
		dst->o_lcookie = src->o_lcookie;

	dst->o_valid |= valid;
}
EXPORT_SYMBOL(obdo_cpy_md);

/* returns FALSE if comparison (by flags) is same, TRUE if changed */
int obdo_cmp_md(struct obdo *dst, struct obdo *src, u32 compare)
{
	int res = 0;

	if (compare & OBD_MD_FLATIME)
		res |= dst->o_atime != src->o_atime;
	if (compare & OBD_MD_FLMTIME)
		res |= dst->o_mtime != src->o_mtime;
	if (compare & OBD_MD_FLCTIME)
		res |= dst->o_ctime != src->o_ctime;
	if (compare & OBD_MD_FLSIZE)
		res |= dst->o_size != src->o_size;
	if (compare & OBD_MD_FLBLOCKS) /* allocation of space */
		res |= dst->o_blocks != src->o_blocks;
	if (compare & OBD_MD_FLBLKSZ)
		res |= dst->o_blksize != src->o_blksize;
	if (compare & OBD_MD_FLTYPE)
		res |= ((dst->o_mode ^ src->o_mode) & S_IFMT) != 0;
	if (compare & OBD_MD_FLMODE)
		res |= ((dst->o_mode ^ src->o_mode) & ~S_IFMT) != 0;
	if (compare & OBD_MD_FLUID)
		res |= dst->o_uid != src->o_uid;
	if (compare & OBD_MD_FLGID)
		res |= dst->o_gid != src->o_gid;
	if (compare & OBD_MD_FLFLAGS)
		res |= dst->o_flags != src->o_flags;
	if (compare & OBD_MD_FLNLINK)
		res |= dst->o_nlink != src->o_nlink;
	if (compare & OBD_MD_FLFID) {
		res |= dst->o_parent_seq != src->o_parent_seq;
		res |= dst->o_parent_ver != src->o_parent_ver;
	}
	if (compare & OBD_MD_FLGENER)
		res |= dst->o_parent_oid != src->o_parent_oid;
	/* XXX Don't know if these should be included here - wasn't previously
	if ( compare & OBD_MD_FLINLINE )
		res |= memcmp(dst->o_inline, src->o_inline);
	*/
	return res;
}
EXPORT_SYMBOL(obdo_cmp_md);

void obdo_to_ioobj(struct obdo *oa, struct obd_ioobj *ioobj)
{
	ioobj->ioo_oid = oa->o_oi;
	if (unlikely(!(oa->o_valid & OBD_MD_FLGROUP)))
		ostid_set_seq_mdt0(&ioobj->ioo_oid);

	/* Since 2.4 this does not contain o_mode in the low 16 bits.
	 * Instead, it holds (bd_md_max_brw - 1) for multi-bulk BRW RPCs */
	ioobj->ioo_max_brw = 0;
}
EXPORT_SYMBOL(obdo_to_ioobj);

void obdo_from_iattr(struct obdo *oa, struct iattr *attr, unsigned int ia_valid)
{
	if (ia_valid & ATTR_ATIME) {
		oa->o_atime = LTIME_S(attr->ia_atime);
		oa->o_valid |= OBD_MD_FLATIME;
	}
	if (ia_valid & ATTR_MTIME) {
		oa->o_mtime = LTIME_S(attr->ia_mtime);
		oa->o_valid |= OBD_MD_FLMTIME;
	}
	if (ia_valid & ATTR_CTIME) {
		oa->o_ctime = LTIME_S(attr->ia_ctime);
		oa->o_valid |= OBD_MD_FLCTIME;
	}
	if (ia_valid & ATTR_SIZE) {
		oa->o_size = attr->ia_size;
		oa->o_valid |= OBD_MD_FLSIZE;
	}
	if (ia_valid & ATTR_MODE) {
		oa->o_mode = attr->ia_mode;
		oa->o_valid |= OBD_MD_FLTYPE | OBD_MD_FLMODE;
		if (!in_group_p(make_kgid(&init_user_ns, oa->o_gid)) &&
		    !capable(CFS_CAP_FSETID))
			oa->o_mode &= ~S_ISGID;
	}
	if (ia_valid & ATTR_UID) {
		oa->o_uid = from_kuid(&init_user_ns, attr->ia_uid);
		oa->o_valid |= OBD_MD_FLUID;
	}
	if (ia_valid & ATTR_GID) {
		oa->o_gid = from_kgid(&init_user_ns, attr->ia_gid);
		oa->o_valid |= OBD_MD_FLGID;
	}
}
EXPORT_SYMBOL(obdo_from_iattr);

void iattr_from_obdo(struct iattr *attr, struct obdo *oa, u32 valid)
{
	valid &= oa->o_valid;

	if (valid & (OBD_MD_FLCTIME | OBD_MD_FLMTIME))
		CDEBUG(D_INODE, "valid %#llx, new time %llu/%llu\n",
		       oa->o_valid, oa->o_mtime, oa->o_ctime);

	attr->ia_valid = 0;
	if (valid & OBD_MD_FLATIME) {
		LTIME_S(attr->ia_atime) = oa->o_atime;
		attr->ia_valid |= ATTR_ATIME;
	}
	if (valid & OBD_MD_FLMTIME) {
		LTIME_S(attr->ia_mtime) = oa->o_mtime;
		attr->ia_valid |= ATTR_MTIME;
	}
	if (valid & OBD_MD_FLCTIME) {
		LTIME_S(attr->ia_ctime) = oa->o_ctime;
		attr->ia_valid |= ATTR_CTIME;
	}
	if (valid & OBD_MD_FLSIZE) {
		attr->ia_size = oa->o_size;
		attr->ia_valid |= ATTR_SIZE;
	}
#if 0   /* you shouldn't be able to change a file's type with setattr */
	if (valid & OBD_MD_FLTYPE) {
		attr->ia_mode = (attr->ia_mode & ~S_IFMT)|(oa->o_mode & S_IFMT);
		attr->ia_valid |= ATTR_MODE;
	}
#endif
	if (valid & OBD_MD_FLMODE) {
		attr->ia_mode = (attr->ia_mode & S_IFMT)|(oa->o_mode & ~S_IFMT);
		attr->ia_valid |= ATTR_MODE;
		if (!in_group_p(make_kgid(&init_user_ns, oa->o_gid)) &&
		    !capable(CFS_CAP_FSETID))
			attr->ia_mode &= ~S_ISGID;
	}
	if (valid & OBD_MD_FLUID) {
		attr->ia_uid = make_kuid(&init_user_ns, oa->o_uid);
		attr->ia_valid |= ATTR_UID;
	}
	if (valid & OBD_MD_FLGID) {
		attr->ia_gid = make_kgid(&init_user_ns, oa->o_gid);
		attr->ia_valid |= ATTR_GID;
	}
}
EXPORT_SYMBOL(iattr_from_obdo);

void md_from_obdo(struct md_op_data *op_data, struct obdo *oa, u32 valid)
{
	iattr_from_obdo(&op_data->op_attr, oa, valid);
	if (valid & OBD_MD_FLBLOCKS) {
		op_data->op_attr_blocks = oa->o_blocks;
		op_data->op_attr.ia_valid |= ATTR_BLOCKS;
	}
	if (valid & OBD_MD_FLFLAGS) {
		((struct ll_iattr *)&op_data->op_attr)->ia_attr_flags =
			oa->o_flags;
		op_data->op_attr.ia_valid |= ATTR_ATTR_FLAG;
	}
}
EXPORT_SYMBOL(md_from_obdo);

void obdo_from_md(struct obdo *oa, struct md_op_data *op_data,
		  unsigned int valid)
{
	obdo_from_iattr(oa, &op_data->op_attr, valid);
	if (valid & ATTR_BLOCKS) {
		oa->o_blocks = op_data->op_attr_blocks;
		oa->o_valid |= OBD_MD_FLBLOCKS;
	}
	if (valid & ATTR_ATTR_FLAG) {
		oa->o_flags =
			((struct ll_iattr *)&op_data->op_attr)->ia_attr_flags;
		oa->o_valid |= OBD_MD_FLFLAGS;
	}
}
EXPORT_SYMBOL(obdo_from_md);

void obdo_cpu_to_le(struct obdo *dobdo, struct obdo *sobdo)
{
	dobdo->o_size = cpu_to_le64(sobdo->o_size);
	dobdo->o_mtime = cpu_to_le64(sobdo->o_mtime);
	dobdo->o_atime = cpu_to_le64(sobdo->o_atime);
	dobdo->o_ctime = cpu_to_le64(sobdo->o_ctime);
	dobdo->o_blocks = cpu_to_le64(sobdo->o_blocks);
	dobdo->o_mode = cpu_to_le32(sobdo->o_mode);
	dobdo->o_uid = cpu_to_le32(sobdo->o_uid);
	dobdo->o_gid = cpu_to_le32(sobdo->o_gid);
	dobdo->o_flags = cpu_to_le32(sobdo->o_flags);
	dobdo->o_nlink = cpu_to_le32(sobdo->o_nlink);
	dobdo->o_blksize = cpu_to_le32(sobdo->o_blksize);
	dobdo->o_valid = cpu_to_le64(sobdo->o_valid);
}
EXPORT_SYMBOL(obdo_cpu_to_le);

void obdo_le_to_cpu(struct obdo *dobdo, struct obdo *sobdo)
{
	dobdo->o_size = le64_to_cpu(sobdo->o_size);
	dobdo->o_mtime = le64_to_cpu(sobdo->o_mtime);
	dobdo->o_atime = le64_to_cpu(sobdo->o_atime);
	dobdo->o_ctime = le64_to_cpu(sobdo->o_ctime);
	dobdo->o_blocks = le64_to_cpu(sobdo->o_blocks);
	dobdo->o_mode = le32_to_cpu(sobdo->o_mode);
	dobdo->o_uid = le32_to_cpu(sobdo->o_uid);
	dobdo->o_gid = le32_to_cpu(sobdo->o_gid);
	dobdo->o_flags = le32_to_cpu(sobdo->o_flags);
	dobdo->o_nlink = le32_to_cpu(sobdo->o_nlink);
	dobdo->o_blksize = le32_to_cpu(sobdo->o_blksize);
	dobdo->o_valid = le64_to_cpu(sobdo->o_valid);
}
EXPORT_SYMBOL(obdo_le_to_cpu);